#!/bin/bash

#####################################################################
####### Script instalador Ogclient
####### Autor: Luis Gerardo Romero <lguillen@unizar.es>
#####################################################################

function globalSetup ()
{
	PROGRAMDIR=$(readlink -e "$(dirname "$0")")
	PROGRAMNAME=$(basename "$0")
        OPENGNSYS_CLIENT_USER="ogdhcp"
	# Comprobar si se ha descargado el paquete comprimido (REMOTE=0) o sólo el instalador (REMOTE=1).
	OPENGNSYS_SERVER="opengnsys.es"
	if [ -d "$PROGRAMDIR/../installer" ]; then
		echo REMOTE=0
		REMOTE=0
	else
		echo REMOTE=1
		REMOTE=1
	fi
	BRANCH=$1
	if [[ -z $BRANCH ]]; then
		BRANCH="main"
	fi
	GIT_REPO="ssh://git@ognproject.evlt.uma.es:21987/opengnsys/ogdhcp.git"

	# Directorios de instalación y destino de OpenGnsys.
	WORKDIR=/tmp/ogdhcp_installer
	INSTALL_TARGET=/opt/ogdhcp
	PATH=$PATH:$INSTALL_TARGET/bin
	if which service &>/dev/null; then
		STARTSERVICE="eval service \$service restart"
		STOPSERVICE="eval service \$service stop"
	else
		STARTSERVICE="eval /etc/init.d/\$service restart"
		STOPSERVICE="eval /etc/init.d/\$service stop"
	fi
		ENABLESERVICE="eval update-rc.d \$service defaults"
		DISABLESERVICE="eval update-rc.d \$service disable"
	APACHESERV=apache2
	APACHECFGDIR=/etc/apache2
	APACHESITESDIR=sites-available
	APACHEOGSITE=ogdhcp
	APACHEUSER="www-data"
	APACHEGROUP="www-data"
	APACHEENABLEMODS="a2enmod headers ssl rewrite proxy_fcgi fastcgi actions alias"
	APACHEENABLESSL="a2ensite default-ssl"
	APACHEENABLEOG="a2ensite $APACHEENABLEOG"
	APACHEMAKECERT="make-ssl-cert generate-default-snakeoil --force-overwrite"
	PHPFPMSERV=php7.2-fpm
	# Registro de incidencias.
	OGLOGFILE=$INSTALL_TARGET/var/log/${PROGRAMNAME%.sh}.log
	LOG_FILE=/tmp/$(basename $OGLOGFILE)

}

function checkDependencies() {
    echoAndLog "Checking dependencies..."

    # Lista de dependencias
    local DEPENDENCIES=(php php-cli php-fpm php-json php-pdo php-mysql php-zip php-gd php-mbstring php-curl php-xml php-pear php-bcmath composer unzip apache2 libapache2-mod-php)

    # Comprobar cada dependencia
    for dep in "${DEPENDENCIES[@]}"; do
        if ! dpkg -s $dep >/dev/null 2>&1; then
            echoAndLog "$dep is not installed. Installing..."
            sudo apt-get install -y $dep
        else
            echoAndLog "$dep is already installed."
        fi
    done

    echoAndLog "Dependencies checked."
}



# Función para instalar los paquetes necesarios para KEA-DHCP
install_kea() {
   sudo apt-get install -y isc-kea-common isc-kea-ctrl-agent isc-kea-dhcp4-server isc-kea-dhcp6-server isc-kea-admin
}

# Función para instalar Composer
install_composer() {
    curl -sS https://getcomposer.org/installer | php
    sudo mv composer.phar /usr/local/bin/composer
}


# Función para instalar Swagger UI
install_swagger() {
    sudo apt-get install -y unzip
    wget https://github.com/swagger-api/swagger-ui/archive/master.zip
    unzip master.zip -d /var/www/html/
    sudo mv /var/www/html/swagger-ui-master /var/www/html/swagger-ui
}


# Obtiene el código fuente del proyecto desde el repositorio de GitHub.
function downloadCode()
{
	if [ $# -ne 1 ]; then
		errorAndLog "${FUNCNAME}(): invalid number of parameters"
		exit 1
	fi

	local url="$1"

	echoAndLog "${FUNCNAME}(): downloading code from '$url'..."

	GIT_SSH_COMMAND="ssh -o StrictHostKeyChecking=accept-new" git archive --remote=$url --format zip --output opengnsys.zip --prefix=opengnsys/ $BRANCH && unzip opengnsys.zip
	if [ $? -ne 0 ]; then
		errorAndLog "${FUNCNAME}(): error getting OpenGnsys code from $url"
		return 1
	fi
	rm -f opengnsys.zip
	echoAndLog "${FUNCNAME}(): code was downloaded"
	return 0
}

# Crea la estructura base de la instalación de opengnsys
function createDirs()
{
    if [ $# -ne 1 ]; then
        errorAndLog "${FUNCNAME}(): invalid number of parameters"
        exit 1
    fi

    local path_opengnsys_base="$1"

    # Crear estructura de directorios.
    echoAndLog "${FUNCNAME}(): creating directory paths in $path_opengnsys_base"
    mkdir -p $path_opengnsys_base
    mkdir -p $path_opengnsys_base/bin
    mkdir -p $path_opengnsys_base/config
    mkdir -p $path_opengnsys_base/docs  # Swagger documentation
    mkdir -p $path_opengnsys_base/public
    mkdir -p $path_opengnsys_base/src
    mkdir -p $path_opengnsys_base/etc/kea/backup
    mkdir -p $path_opengnsys_base/templates
    mkdir -p $path_opengnsys_base/var/{cache,log}
    mkdir -p $path_opengnsys_base/vendor
    if [ $? -ne 0 ]; then
        errorAndLog "${FUNCNAME}(): error while creating dirs. Do you have write permissions?"
        return 1
    fi

    # Crear usuario ficticio.
    if id -u $OPENGNSYS_CLIENT_USER &>/dev/null; then
        echoAndLog "${FUNCNAME}(): user \"$OPENGNSYS_CLIENT_USER\" is already created"
    else
        echoAndLog "${FUNCNAME}(): creating OpenGnsys user"
        useradd $OPENGNSYS_CLIENT_USER 2>/dev/null
        if [ $? -ne 0 ]; then
            errorAndLog "${FUNCNAME}(): error creating OpenGnsys user"
            return 1
        fi
    fi


    # Mover el fichero de registro de instalación al directorio de logs.
    echoAndLog "${FUNCNAME}(): moving installation log file"
    mv $LOG_FILE $path_opengnsys_base/var/log && LOG_FILE=$OGLOGFILE
    chmod 777 $LOG_FILE
    sudo chmod -R 777 $path_opengnsys_base/etc

   # Mover el fichero de registro de instalación al directorio de logs.
    echoAndLog "${FUNCNAME}(): moving installation log file"
    touch $path_opengnsys_base/var/log/dev.log
    chmod 777 $path_opengnsys_base/var/log/dev.log

    echoAndLog "${FUNCNAME}(): directory paths created"
    return 0
    echoAndLog "Changing user permission"
    chown -R $OPENGNSYS_CLIENT_USER:$OPENGNSYS_CLIENT_USER $INSTALL_TARGET

    # Copia de antemano .env ya que es necesario para montar el esqueleto de symfony
    cp -a $WORKDIR/ogdhcp/.env "${path_opengnsys_base}/.env"
}



function create_ogdhcp_project {
    # Cambia al usuario ogdhcp y crea el proyecto Symfony
    local path_opengnsys_base="$1"
    composer create-project symfony/website-skeleton $path_opengnsys_base
    pushd $path_opengnsys_base
    # Elimina el archivo composer.lock
    rm composer.lock
    popd
    echoAndLog "Esqueleto de la aplicación creado y archivo composer.lock eliminado."
}


function copyServerFiles ()
{
    if [ $# -ne 1 ]; then
        errorAndLog "${FUNCNAME}(): invalid number of parameters"
        exit 1
    fi

    local path_opengnsys_base="$1"

    # Lista de ficheros y directorios origen y de directorios destino.
    local SOURCES=(
            config \
            #public \
            src \
	    etc \
            templates \
            tests \
            vendor \
            .env \
            composer.json \
            composer.lock \
            phpunit.xml.dist \
            symfony.lock )
    local TARGETS=(
            config \
            #public \
            src \
	    etc \
            templates \
            tests \
            vendor \
            .env \
            composer.json \
            composer.lock \
            phpunit.xml.dist \
            symfony.lock )

    if [ ${#SOURCES[@]} != ${#TARGETS[@]} ]; then
        errorAndLog "${FUNCNAME}(): inconsistent number of array items"
        exit 1
    fi

    # Copiar ficheros.
    echoAndLog "${FUNCNAME}(): copying files to server directories"

    pushd $WORKDIR/ogdhcp
    local i
    for (( i = 0; i < ${#SOURCES[@]}; i++ )); do
        if [ -f "${SOURCES[$i]}" ]; then
            echoAndLog "Copying ${SOURCES[$i]} to $path_opengnsys_base/${TARGETS[$i]}"
            cp -a "${SOURCES[$i]}" "${path_opengnsys_base}/${TARGETS[$i]}"
        elif [ -d "${SOURCES[$i]}" ]; then
            echoAndLog "Copying content of ${SOURCES[$i]} to $path_opengnsys_base/${TARGETS[$i]}"
            cp -a "${SOURCES[$i]}"/* "${path_opengnsys_base}/${TARGETS[$i]}"
        else
            warningAndLog "Unable to copy ${SOURCES[$i]} to $path_opengnsys_base/${TARGETS[$i]}"
        fi
    done
    echoAndLog "Changing user permission"
    chown -R $OPENGNSYS_CLIENT_USER:$OPENGNSYS_CLIENT_USER $INSTALL_TARGET


    popd
}

function downloadComposer() {
    echoAndLog "Downloading composer.phar..."

    # Crear el directorio de trabajo si no existe
    mkdir -p $WORKDIR/ogdhcp/bin

    # Cambiar al directorio de trabajo
    pushd $WORKDIR/ogdhcp/bin

    # Descargar composer.phar
    curl -sS https://getcomposer.org/installer | php

    # Comprobar si la descarga fue exitosa
    if [ ! -f composer.phar ]; then
        errorAndLog "Failed to download composer.phar"
        popd
        return 1
    fi

    # Crear el directorio de destino si no existe
    mkdir -p /opt/ogdhcp/bin

    # Mover composer.phar a /opt/ogdhcp/bin
    mv composer.phar /opt/ogdhcp/bin/

    # Comprobar si el movimiento fue exitoso
    if [ ! -f /opt/ogdhcp/bin/composer.phar ]; then
        errorAndLog "Failed to move composer.phar to /opt/ogdhcp/bin"
        popd
        return 1
    fi

    # Volver al directorio original
    popd

    echoAndLog "composer.phar downloaded and moved to /opt/ogdhcp/bin"
    return 0
}

function runComposer() {
    echoAndLog "Running composer.phar to install dependencies..."

    # Cambiar al directorio donde está composer.phar
    pushd /opt/ogdhcp/bin

    # Ejecutar composer.phar
    sudo -u $OPENGNSYS_CLIENT_USER php composer.phar install

    # Comprobar si la ejecución fue exitosa
    if [ $? -ne 0 ]; then
        errorAndLog "Failed to run composer.phar"
        popd
        return 1
    fi

    # Volver al directorio original
    popd

    echoAndLog "composer.phar ran successfully and dependencies were installed"
    return 0
}
function install_swagger_ui {
    # Define la URL del archivo de Swagger UI que quieres descargar
    swagger_ui_url="https://github.com/swagger-api/swagger-ui/archive/refs/heads/master.zip"

    # Define la ruta donde quieres descomprimir Swagger UI
    swagger_ui_path="/tmp/swagger-ui"

    # Define la ruta de destino para los archivos de Swagger UI
    destination_path="/opt/ogdhcp/public"

    # Crea los directorios si no existen
    mkdir -p $swagger_ui_path
    mkdir -p $destination_path

    # Descarga el archivo de Swagger UI
    wget $swagger_ui_url -O /tmp/swagger-ui.zip

    # Descomprime el archivo de Swagger UI en la ruta especificada
    unzip /tmp/swagger-ui.zip -d $swagger_ui_path

    # Copia los archivos de Swagger UI al directorio de destino
    cp -r $swagger_ui_path/swagger-ui-master/dist/* $destination_path

    # Elimina el archivo descargado y el directorio temporal
    rm /tmp/swagger-ui.zip
    rm -r $swagger_ui_path
    /opt/ogdhcp/vendor/bin/openapi /opt/ogdhcp/src/DhcpBundle/Controller/ -o /opt/ogdhcp/public/swagger.json
    echo "Swagger UI instalado en $destination_path."
}

create_kea_source_list() {
    # Comprobar si el sistema operativo es Ubuntu 18.04
    if [[ "$(lsb_release -rs)" == "18.04" ]]; then
        echo "Creating isc-kea-2-0.list file..."

        # Crear el archivo isc-kea-2-0.list
        echo "
deb [signed-by=/usr/share/keyrings/isc-kea-2-0-archive-keyring.gpg] https://dl.cloudsmith.io/public/isc/kea-2-0/deb/ubuntu jammy main

deb-src [signed-by=/usr/share/keyrings/isc-kea-2-0-archive-keyring.gpg] https://dl.cloudsmith.io/public/isc/kea-2-0/deb/ubuntu jammy main" | sudo tee /etc/apt/sources.list.d/isc-kea-2-0.list

        echo "File created successfully."
    else
        echo "This script is only for Ubuntu 18.04."
    fi
}

function installWebConsoleApacheConf()
{
    if [ $# -ne 2 ]; then
        errorAndLog "${FUNCNAME}(): invalid number of parameters"
        exit 1
    fi

    local path_opengnsys_base="$1"
    local path_apache2_confd="$2"
    local OGHDPCDIR=${path_opengnsys_base}/public
    local sockfile

    if [ ! -d $path_apache2_confd ]; then
        errorAndLog "${FUNCNAME}(): path to apache2 conf.d can not found, verify your server installation"
        return 1
    fi

        mkdir -p $path_apache2_confd/{sites-available,sites-enabled}

    echoAndLog "${FUNCNAME}(): creating apache2 config file.."

    # Avtivar PHP-FPM.
    echoAndLog "${FUNCNAME}(): configuring PHP-FPM"
    service=$PHPFPMSERV
    $ENABLESERVICE; $STARTSERVICE
    sockfile=$(find /run/php -name "php*.sock" -type s -print 2>/dev/null | tail -1)

    # Activar módulos de Apache.
    $APACHEENABLEMODS

    # Genera configuración de consola web a partir del fichero plantilla.
    if [ -n "$sockfile" ]; then
        sed -e "s,OGHDPCDIR,$OGHDPCDIR,g" \
            -e "s,proxy:fcgi:.*,proxy:unix:${sockfile%% *}|fcgi://localhost\",g" \
            $WORKDIR/ogdhcp/etc/apache.conf.tmpl > $path_apache2_confd/$APACHESITESDIR/${APACHEOGSITE}.conf
    else
        sed -e "s,OGHDPCDIR,$OGHDPCDIR,g" \
            $WORKDIR/ogdhcp/server/etc/apache.conf.tmpl > $path_apache2_confd/$APACHESITESDIR/${APACHEOGSITE}.conf
    fi
    $APACHEENABLEOG
    if [ $? -ne 0 ]; then
        errorAndLog "${FUNCNAME}(): config file can't be linked to apache conf, verify your server installation"
        return 1
    fi
    echoAndLog "${FUNCNAME}(): config file created and linked, restarting apache daemon"
    service=$APACHESERV
    $ENABLESERVICE; $STARTSERVICE
    return 0
}


#####################################################################
####### Algunas funciones útiles de propósito general:
#####################################################################

function getDateTime()
{
	date "+%Y%m%d-%H%M%S"
}

# Escribe a fichero y muestra por pantalla
function echoAndLog()
{
	local DATETIME=`getDateTime`
	echo "$1"
	echo $LOG_FILE
	echo "$DATETIME;$SSH_CLIENT;$1" >> $LOG_FILE
}

# Escribe a fichero y muestra mensaje de error
function errorAndLog()
{
	local DATETIME=`getDateTime`
	echo "ERROR: $1"
	echo "$DATETIME;$SSH_CLIENT;ERROR: $1" >> $LOG_FILE
}

# Escribe a fichero y muestra mensaje de aviso
function warningAndLog()
{
	local DATETIME=`getDateTime`
	echo "Warning: $1"
	echo "$DATETIME;$SSH_CLIENT;Warning: $1" >> $LOG_FILE
}

##########################################################################
################################main######################################


# Sólo ejecutable por usuario root
if [ "$(whoami)" != 'root' ]; then
		echo "ERROR: this program must run under root privileges!!"
		exit 1
fi

globalSetup

echoAndLog "OpenGnsys installation begins at $(date)"

mkdir -p $WORKDIR
pushd $WORKDIR
create_kea_source_list
checkDependencies
install_kea
# Si es necesario, descarga el repositorio de código en directorio temporal
if [ $REMOTE -eq 1 ]; then
	downloadCode $GIT_REPO
	if [ $? -ne 0 ]; then
		errorAndLog "Error while getting code from the repository"
		exit 1
	fi
else
	ln -fs "$(dirname $PROGRAMDIR)" ogdhcp
fi

create_ogdhcp_project ${INSTALL_TARGET}
if [ $? -ne 0 ]; then
        errorAndLog "Error while creating skeleton directory!"
        exit 1
fi

# Arbol de directorios de OpenGnsys.
createDirs ${INSTALL_TARGET}
if [ $? -ne 0 ]; then
	errorAndLog "Error while creating directory paths!"
	exit 1
fi


# Copiar ficheros de servicios OpenGnsys Server.
copyServerFiles ${INSTALL_TARGET}
if [ $? -ne 0 ]; then
	errorAndLog "Error while copying the server files!"
	exit 1
fi

downloadComposer

runComposer
install_swagger_ui
# Creando configuración de Apache.
installWebConsoleApacheConf $INSTALL_TARGET $APACHECFGDIR
if [ $? -ne 0 ]; then
	errorAndLog "Error configuring Apache for OpenGnsys Admin"
	exit 1
fi

sudo apt-get update
# install_kea
# install_php
# install_composer
# install_symfony
# install_swagger
# Ahora puedes clonar e instalar el componente ogDhcp
# git clone <URL del repositorio de ogDhcp>
# cd <directorio de ogDhcp>
# composer install